On Jun 30, 5:16 pm, "David Joyner" <[EMAIL PROTECTED]> wrote:
> Do you mean the tuple is represented in the disjoint cycle notation and
> is a cyclic permutation? In that case, you can use:
>
> sage: PermutationGroupElement('(3,6,4)').sign()
> 1
> sage: PermutationGroupElement('(5,3,6,4)').sign()
> -1
>
No, by "one-line permutation notation", I mean that (3,6,4) means the
permutation where 3 -> 3, 4 -> 6, and 6 -> 4, while (5,3,8,6) is the
permutation of (3,5,8,6) in which 3 and 5 have been interchanged, as
have 6 and 8.
> On Mon, Jun 30, 2008 at 7:17 PM, John H Palmieri <[EMAIL PROTECTED]> wrote:
>
>
>
> > Suppose I have a tuple x of distinct non-negative integers. Is there
> > a quick way to find the sign of this, as a permutation of Set(x)? (I
> > want to view x as the one-line permutation notation form, so (3,6,4)
> > will have sign -1, while (5,3,8,6) will have sign 1.)
>
> > The things I can find in combinat/... don't quite seem to do what I
> > want. I can build something myself, but if there is a quick solution,
> > I would prefer that.
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